Posterior tongue grooving in deglutition and speech: Preliminary observations
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Real-time ultrasound sector scanning was used to image the posterior tongue. Depth of tongue grooving and distance of the tongue surface from the transducer face were measured in 7 normal subjects, for vowels in a standardized speech context and for dry swallows. Tongue postures for the vowels |æ| or |e| were most similar to the maximum grooving found in deglutition, which occurred approximately 300 ms prior to ultrasound evidence of initiation of the reflexive pharyngeal phase of swallowing.
Key wordsDeglutition Tongue groove Speech, normal
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